In an email to Tech Insider, a T-Mobile spokesperson confirmed that the carrier will “automatically optimise video” for people who are signed up for the new program, and said that delivering video this way “is 2.2X more efficient than HD coming over the network with minimal difference in viewing experience.”

That remains to be seen, as most new smartphones are capable of supporting HD video, and as consumer’s were accustomed to viewing it.

Customers can opt in and out of Binge On on T-Mobile’s website, using the app, or by calling customer service.